Summary of Significant Accounting Policies - Basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income	$ 3,460	$ 9,500
Less: Income allocated to unvested participating securities	111	149
Net income available to common shareholders	$ 3,349	$ 9,351
Denominator:
Denominator for basic earnings per share - weighted average shares	6,075,000	6,045,000
Effect of dilutive securities:
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions	6,075,000	6,045,000
Earnings per share:
Basic (in dollars per share)	$ 0.55	$ 1.55
Diluted earnings (loss) per share:
Diluted (in dollars per share)	$ 0.55	$ 1.55
Antidilutive securities excluded from computation of earnings per share, amount	0	0